Swivel arm attachment for a helmet



FIG. 1 is an elevational view of a swivel arm attachment for a helmet,showing my new design;

FIG. 2 is an elevational view seen from the right side thereof, theopposite side being a mirror image; and,

FIG. 3 is a perspective view of the side opposite that shown in FIG. 1.

The ornamental design for a swivel arm attachment for a helmet, as shownand described.